978771 has 4 divisors (see below), whose sum is σ = 1305032. Its totient is φ = 652512.

The previous prime is 978749. The next prime is 978773. The reversal of 978771 is 177879.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 978771 - 2⁷ = 978643 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163126 + ... + 163131.

It is an arithmetic number, because the mean of its divisors is an integer number (326258).

2⁹⁷⁸⁷⁷¹ is an apocalyptic number.

978771 is a deficient number, since it is larger than the sum of its proper divisors (326261).

978771 is a wasteful number, since it uses less digits than its factorization.

978771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326260.

The product of its digits is 24696, while the sum is 39.

The square root of 978771 is about 989.3285601861. The cubic root of 978771 is about 99.2872993110.

The spelling of 978771 in words is "nine hundred seventy-eight thousand, seven hundred seventy-one".